Running ruby globally without ISPC3 option to disable per host

I know that ISPConfig3 doesn't support ruby for the moment, however I was wondering something.
I would really prefer to work with ISPConfig3 instead of 2, but also need ruby.

So would it be possible to just install mod_ruby in apache, and enable it globally somehow? I don't mind that it would be running for everyone. If I just installed the rails gem, would I be able to run RoR apps then?